The Pro looks great on you. You should not hesitate to go for it if you like it better
I have also a 6.25" wrist. I have a reduced instead of a Pro but I had the occasion to try a Pro and a FOIS, while wearing my reduced. So I could compare them. Obviously, the Reduced wears smaller. But there was no real difference between the FOIS (40mm) and the Pro (42mm) and I was surprised by how nice it wears. I actually liked the Pro better than the FOIS. I cannot explain why but the FOIS "only" felt like a big Reduced, which is weird because the Reduced design is closest to the Pro..
The lug to lug length of the Pro is around 47mm. It is less than many 40 or 39mm watches
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